formatting_fr_icons test

[Gavin Smith]

Among the many changes to the test results that happened there (in commit
0c6f9bba0c2e) there was a change to

tp/tests/layout/res_parser/formatting_fr_icons/formatting.html

I hadn't gotten round to investigating but there were problems with that
test after I updated the translations.  I only knew about it because of
the OpenCSW build farm:

https://buildfarm.opencsw.org/buildbot/builders/texinfo-solaris11-i386/builds/2257/steps/shell_3/logs/tp_tests_test-suite.log

Among the changes to the test results, there is this change:

-<dt id="index-titlepage-d_002d_002deffn_005fname"><span 
class="category">c--ategory&nbsp;: </span><span><strong>d--effn_name</strong> 
<em>a--rguments...</em><a href='#index-titlepage-d_002d_002deffn_005fname' 
class='copiable-anchor'> &para;</a></span></dt>
+<dt id="index-titlepage-d_002d_002deffn_005fname"><span 
class="category">c--ategory: </span><span><strong>d--effn_name</strong> 
<em>a--rguments...</em><a href='#index-titlepage-d_002d_002deffn_005fname' 
class='copiable-anchor'> &para;</a></span></dt>

I guess this is wrong as the non-breaking space before the colon has 
disappeared.

I am going to investigate this (and whether the test was failing before this
update) but we need to fix this before anything else.